Question: When did the Delhi Metro have a daily patronage of 279e+06?
Paraphrase: What was the date that Delhi Metro had a daily patronage of 279e+06.
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q271195 p:P1373 ?s . ?s ps:P1373 ?x filter(contains(?x , '2.79e+06')) . ?s pq:P585 ?value}